mirroring is a technique that replicates all the content of a hard disk onto another hard disk. This technology was first developed for network servers for file back-up and security reasons. In case de primary hard disk fails the mirror (or mirrored) disk starts to work. the term in Spanish has no exact translation because is very jargon-like. Most technicians use disco espejo, o mirror (in English) or even the spanglish mirroreado. About install is a contraction on installation meaning installation icluded